5.16.5: automake and gcc warnings

[kloczek]

automake warnings:

configure.ac:20: warning: The 'AM_PROG_MKDIR_P' macro is deprecated, and its use is discouraged.
configure.ac:20: You should use the Autoconf-provided 'AC_PROG_MKDIR_P' macro instead,
configure.ac:20: and use '$(MKDIR_P)' instead of '$(mkdir_p)'in your Makefile.am files.
configure.ac:15: installing 'build-aux/compile'
configure.ac:9: installing 'build-aux/missing'
mission-control-plugins/Makefile.am:1: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
mission-control-plugins/Makefile.am: installing 'build-aux/depcomp'
plugins/Makefile.am:1: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
src/Makefile.am:1: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
src/Makefile.am:55: warning: source file '_gen/svc-Account_Interface_Conditions.c' is in a subdirectory,
src/Makefile.am:55: but option 'subdir-objects' is disabled
automake: warning: possible forward-incompatibility.
automake: At least a source file is in a subdirectory, but the 'subdir-objects'
automake: automake option hasn't been enabled.  For now, the corresponding output
automake: object file(s) will be placed in the top-level directory.  However,
automake: this behaviour will change in future Automake versions: they will
automake: unconditionally cause object files to be placed in the same subdirectory
automake: of the corresponding sources.
automake: You are advised to start using 'subdir-objects' option throughout your
automake: project, to avoid future incompatibilities.
src/Makefile.am:55: warning: source file '_gen/svc-Account_Interface_External_Password_Storage.c' is in a subdirectory,
src/Makefile.am:55: but option 'subdir-objects' is disabled
src/Makefile.am:55: warning: source file '_gen/svc-Account_Interface_Hidden.c' is in a subdirectory,
src/Makefile.am:55: but option 'subdir-objects' is disabled
src/Makefile.am:55: warning: source file '_gen/svc-Account_Manager_Interface_Hidden.c' is in a subdirectory,
src/Makefile.am:55: but option 'subdir-objects' is disabled
src/Makefile.am:55: warning: source file '_gen/svc-dispatcher.c' is in a subdirectory,
src/Makefile.am:55: but option 'subdir-objects' is disabled
tests/Makefile.am:1: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
tests/twisted/Makefile.am:228: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')

gcc 10 warnings:

mcd-operation.c: In function '_mcd_operation_dispose':
mcd-operation.c:145:34: warning: cast between incompatible function types from 'void (*)(McdMission *)' {aka 'void (*)(struct _McdMission *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  145 |  g_list_foreach (priv->missions, (GFunc) _mcd_operation_child_unref,
      |                                  ^
mcd-operation.c: In function '_mcd_operation_connect':
mcd-operation.c:157:37: warning: cast between incompatible function types from 'void (*)(McdMission *)' {aka 'void (*)(struct _McdMission *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  157 |     g_list_foreach (priv->missions, (GFunc) mcd_mission_connect, NULL);
      |                                     ^
mcd-operation.c: In function '_mcd_operation_disconnect':
mcd-operation.c:165:37: warning: cast between incompatible function types from 'void (*)(McdMission *)' {aka 'void (*)(struct _McdMission *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  165 |     g_list_foreach (priv->missions, (GFunc) mcd_mission_disconnect, NULL);
      |                                     ^
mcd-client.c: In function 'mcd_client_proxy_free_client_filters':
mcd-client.c:1327:42: warning: cast between incompatible function types from 'void (*)(GHashTable *)' {aka 'void (*)(struct _GHashTable *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
 1327 |         g_list_foreach (*client_filters, (GFunc) g_hash_table_unref, NULL);
      |                                          ^
mcd-account-requests.c: In function '_mcd_account_create_request':
mcd-account-requests.c:164:28: warning: cast between incompatible function types from 'void (*)(void *)' to 'void (*)(void *, GClosure *)' {aka 'void (*)(void *, struct _GClosure *)'} [-Wcast-function-type]
  164 |                            (GClosureNotify) g_object_unref,
      |                            ^
mcd-account-requests.c:173:28: warning: cast between incompatible function types from 'void (*)(void *)' to 'void (*)(void *, GClosure *)' {aka 'void (*)(void *, struct _GClosure *)'} [-Wcast-function-type]
  173 |                            (GClosureNotify) g_object_unref,
      |                            ^
mcd-account-requests.c:179:28: warning: cast between incompatible function types from 'void (*)(void *)' to 'void (*)(void *, GClosure *)' {aka 'void (*)(void *, struct _GClosure *)'} [-Wcast-function-type]
  179 |                            (GClosureNotify) g_object_unref,
      |                            ^
mcd-manager.c: In function '_mcd_manager_disconnect':
mcd-manager.c:155:34: warning: cast between incompatible function types from 'void (*)(McdMission *)' {aka 'void (*)(struct _McdMission *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  155 |     g_list_foreach (connections, (GFunc) mcd_mission_abort, NULL);
      |                                  ^
mcd-dispatcher.c: In function 'mcd_dispatcher_client_registry_ready_cb':
mcd-dispatcher.c:697:31: warning: cast between incompatible function types from 'void (*)(GValueArray *)' {aka 'void (*)(struct _GValueArray *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  697 |     g_ptr_array_foreach (vas, (GFunc) g_value_array_free, NULL);
      |                               ^
mcd-dispatcher.c: In function 'mcd_dispatcher_update_client_caps':
mcd-dispatcher.c:788:31: warning: cast between incompatible function types from 'void (*)(GValueArray *)' {aka 'void (*)(struct _GValueArray *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
  788 |     g_ptr_array_foreach (vas, (GFunc) g_value_array_free, NULL);
      |                               ^
mcd-dispatcher.c: In function '_mcd_dispatcher_add_connection':
mcd-dispatcher.c:1534:35: warning: cast between incompatible function types from 'void (*)(GValueArray *)' {aka 'void (*)(struct _GValueArray *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
 1534 |         g_ptr_array_foreach (vas, (GFunc) g_value_array_free, NULL);
      |                                   ^
mcd-dispatcher.c: In function 'message_context_steal':
mcd-dispatcher.c:1559:13: warning: Deprecated pre-processor symbol, replace with
 1559 |     g_memmove (stolen, from, sizeof (MessageContext));
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mcd-dispatcher.c: In function 'channel_to_delegate_free':
mcd-dispatcher.c:1918:38: warning: cast between incompatible function types from 'void (*)(void *)' to 'void (*)(void *, void *)' [-Wcast-function-type]
 1918 |     g_queue_foreach (chan->handlers, (GFunc) g_object_unref, NULL);
      |                                      ^
mcd-connection.c: In function 'mcd_connection_early_get_interfaces_cb':
mcd-connection.c:1361:42: warning: cast between incompatible function types from 'void (*)(GValueArray *)' {aka 'void (*)(struct _GValueArray *)'} to 'void (*)(void *, void *)' [-Wcast-function-type]
 1361 |                                          (GFunc) g_value_array_free, NULL);
      |                                          ^
mcd-dispatch-operation.c: In function 'mcd_dispatch_operation_dispose':
mcd-dispatch-operation.c:1332:43: warning: cast between incompatible function types from 'void (*)(Approval *)' to 'void (*)(void *, void *)' [-Wcast-function-type]
 1332 |         g_queue_foreach (priv->approvals, (GFunc) approval_free, NULL);
      |                                           ^
mcd-account.c: In function 'mc_param_type':
mcd-account.c:2473:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
 2473 |         if (dbus_signature[1] == DBUS_TYPE_STRING)
      |            ^
mcd-account.c:2477:5: note: here
 2477 |     default:
      |     ^~~~~~~
account-store.c: In function 'main':
account-store.c:137:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
  137 |         if (argc >= 6)
      |            ^
account-store.c:140:7: note: here
  140 |       case OP_GET:
      |       ^~~~
In file included from value-is-same.c:27:
../src/mcd-account.c: In function 'mc_param_type':
../src/mcd-account.c:2473:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
 2473 |         if (dbus_signature[1] == DBUS_TYPE_STRING)
      |            ^
../src/mcd-account.c:2477:5: note: here
 2477 |     default:
      |     ^~~~~~~

[Kaffeine]

I have no idea how to fix the cast between incompatible function types warnings.